胶带快速转移水油液液界面自组装纳米金制备透明柔性SERS基底

Flexible SERS Substrate Fabricated by Liquid-Liquid Self-Assembly of Gold Nanoparticles Transferred on Transparent Tape

表面增强拉曼(SERS)是一种快速灵敏的表面分析检测技术。提出了一种简便快捷的制备高活性的透明柔性SERS基底,使用乙醇诱导Au NPs从水溶液中组装到水/油界面的形成致密的Au MLF后再用透明胶带转移即制备完成了SERS基底。UV-Vis和SEM测试结果显示纳米金被紧密的吸附在透明胶带上。通过调控Au溶胶的浓度以及加入乙醇与Au溶胶的体积比来控制Au纳米粒子在胶带的密度,发现加入的氯金酸体积0.4mL,乙醇与Au溶胶体积比10∶4时,制备完成的Au/Tape基底具有最佳的活性,以孔雀石绿分子为拉曼探针计算了Au/Tape基底的增强因子EF为1.8×107。此基底在非平整表面现场超灵敏快速检测具有潜力。

A simple and rapid method for fabricating a surface-enhanced Raman scattering(SERS)substrate was proposed,which offers good flexibility,excellent optical transparency,and high SERS activity.The SERS substrate(Au NPs/Tape film)was obtained through self-assembly of gold nanoparticles(Au NPs)on water/oil surface with injecting ethanol,then the formed Au Molecule Layer Film(Au MLF)was transfered to transparent tape.The scanning electron microscopy revealed that the gold nanoparticles were closely assembled on the flexible and transparent tape.Changing the density of Au NPS through controling the concentration of Au sol and ratio of ethanol/Au sol,the best Raman intensity was abtained at 0.4 mL HAuCl and ratio of ethanol/Au sol at 10∶4.The Raman enhancement factor(EF)of Malachite Green was found to be as high as 1.8×107,which shows a great potential in the in-situ ultrasensitive detection of analyte on irregular objects.